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书的示例代码在 http://pix.cs.olemiss.edu/csci561/prg561.1.html 我在Ubuntu 10.10上编译会出现错误如下错误 tcpservpoll01.c: In function ‘main’: tcpservpoll01.c:13: error: ‘OPEN_MAX’ undeclared (first use in this function) tcpservpoll01.c:13: error: (Each undeclared identifier is reported only once tcpservpoll01.c:13: error: for each function it appears in.) tcpservpoll01.c:13: warning: unused variable ‘client’ make: *** [tcpservpoll01.o] Error 1 解决方案是去定义一下OPEN_MAX它。 我们在unp.h里面加上 #define OPEN_MAX 1024 就好了。 设为1024的原因见 http://blog.chinaunix.net/space.php?uid=23242876&do=blog&id=2480261